Stop mechanism for knitting machines



Feb. 2 1926.

F. NEVEUX STOP MECHANISM FOR KNITTING MACHINES Filed March 9, 1923 F W14 I gnucnhw,

Patented F ch. 2, 1926.

UNITED STATES FORTUNATO NEVEUX, OF RIVOLI, TURIN,

ITALY, assrenon To 0. M. I. at. orrroma MECCANICA INDUSTRIA MAGLIEBIA, F TURIN, ITALY, A COMPANY.

STOP MECHANISM FOR KNITTING MACHINES.

Application filed March 9, 1923. Serial No. 624,004.

. Z '0 all whom it may concern:

Be it known that I, FORTUNATO NEVEUX, a citizen of the Kingdom of Italy, residing at Rivoli, Turin, Italy, have invented certain new and useful Improvements in Stop Mechanism for Knitting Machines, of which the following is a full, clear, and exact specification.

The stop mechanism which is the subject of this invention is applicable to knitting machines of the French circular type and is particularly adapted to the high speed machines of this type (mailleuses obliques) in which loop wheels are employed having axes inclined to the radius of the machine, i. e., non-radial loop-wheels thereby avoiding the use of horizontal cams to displace the sinkers and so move the newly formed loops toward the needle beards. While this stop mechanism is well adapted for use with machines of this character it is not necessarily limited thereto nor to use in connectionwith knitting machines. In machines of this character having one or more inclined or non-radial loop wheels it is to be understood that the yarn is moved along the needle shanks by the rotation of the loop wheel since the latter when'turning will cause each sinker to move radially of the machine relatively to its needle thus carrying the loops toward the beards.

s In machines of this character automatic stopping devices must be used to stop the machine in order to prevent the fabric from running off the needles 0n breakage of yarn. In practice itis necessary to stop the working of the machineat a time when at least five or six wales remain between the breaking point of the yarn and the last knitted stitch, i. e. there mustbe five or six loops sunk between the needles but not yet knitted. It is an object of my invention to provide a device in which this result may be obtained without stopping-therotation of the machine by causing the beard presser and the sinker cam operating the needle beards and the sinkers respectively to be removed from the usual positions relatively to the loop wheel practically at the instant of yarn failure.

It will be understood that the operation of the device may be so modified as to actually stop the machine and especially that this could be done in connection with, an elec- 'trical arrangement in such a way as to cause breaking of a suitable electric circuit due to failure of the yarn.

The accompanying drawing shows some what diagrammatically a physical embodiment of the invention; and in the drawing:

I1 igure 1 is a vertical sectional elevation, 31;

Figure 2 aside view of the device.

Figure 2 is an enlarged view showing the intermeshing teeth of the thread feeding wheels or gears and the manner in which the thread passes between them.

The thread feeding device, controlling the supply of thread from the bobbins to the plate drum, consists, as usual, of a pair of toothed gears 1, 2, between the teeth of which passes the thread 3 coming from a bobbin and fed to the loop wheel in the direction of the arrow f It is known that, by displacing said gears nearer to, or farther from, each-other, in any suitable way, the tension of the thread will either be increased or decreased.

The spur-gear 1, usually rotating as shown by the arrow f, is provided with a hollow shaft 5, to 'wlnch is secured a flanged crown gear 4:, while a ring 6, provided in the outer face with a number of equi-distantly spaced projections 7, carries pinions 8 cooperating with the crown 4. Opposite the projections .7 is a hook 9 movable about a pivot 10 and kept a little distance apart from the path of the projections 7 by means of a length of wire 11, preferably steel wire, a hook at an end of said wire engaging the yarn prior to its engagement with gears 1 and 2.

In the usual operation of the machine, the planetary pinions 8 driven by the crown gear 4 will travel around the opposite crown 12 secured to the inner shaft 13 (for the sake of clearness, the latter crown gear has been removed in Fig. 2).

When the thread 3 fed to the loop wheel breaks off, thus releasing the holding wire 11, the hook 9 will swing into the path of movement of the projections 7, and thereby cause the ring 6 and the planetary device carried thereby to stop. The pinions, S, 8, being prevented from traveling around the crown 12, will cause the latter to turn .in the direction shown by the arrow f, together with the inner shaft 13, so that a pin- 1011 which may be merely a toothed segment 14 secured to the shaft 13 and engaged with atoothed rack 15 capable'of a rectilinear displacement, will, cause the latter to move in the direction of the arrow f", so that the presser as well as the sinker cam, connected to said rack in any suitable way, will be removed from their operative position.

I dispense with describing and illustrating more particularly the connections above referred to, since they will be easily understood by any one skilled in the art, the only object of this invention being the means, such as has been described and illustrated, to automatically 0 erate the holding-rack 15 in the direction esired.

It will also be understood that the knitting machine itself would be able in a similar manner to be actually stopped by providing the same with an electric arrangement of any suitable kind and causing the electric circuit to be interrupted either directly or indirectly by the displacement of the holding rack, or

' any like device operated by the reversing-gear operation caused by the thread breaking.

Havin thus fully described my invention, what I c aim as new and desire to secure by Letters Patent is:

1. In a stop mechanism for knitting 'machines, a rack, a pinion engaging the rack, a normally stationary shaft carrying said pinion, yarn feeding gears, planetary gearing including crown gears fixed respectively to said shaft and to one of said' gears, pinions engaging the crown gears, a ring supporting said pinions, hooks on said ring, a pivoted hook adjacent said ring, and a hook engaging the thread said last-named hook being connected to the pivoted hook to hold the same out of engagement with the hooks on said ring, substantially as set forth.

2. In a stop mechanism for knitting machines, planetary gearing including a normally stationary element, an element having planetary movement, means adapted to interrupt the revolution of the planetary element said means being controlled by a knitting yarn, connections between said elements for moving the normally stationary element when the revolution of the planetary element is stopped, and connections whereby the normally stationary element interrupts the knitting operation when moved, substantially as set forth.

3. In a stop mechanism for knitting machines, planetary gearing including a normally stationary crown gear, a normally rotary crown gear, a planetary pinion between them, yarn-controlled means for stopping the revolution of the planetary pinion, and connections between said crown gears for thereupon rotating the normally stationary crown gear said connections comprising a pinion fixed to the normally stationary crown gear and a rack operated thereby, substantially as set forth.

4. In a strand controlled sto mechanism, a planetary pinion, a normal y stationary gear engaging the planetary pinion, a nor- 'mally rotary gear engaging the planetary pinion, a strand feed wheel moving with said normally rotary gear, means for in terrupting the revolution of the planetary pinion on failure of the strand whereby the normally stationary gear is caused to rotate, and connections from said gear to means for interrupting the operation of the machine, substantially as set forth.

In wltness whereof I have hereunto signed my name.

FORTUNATO NEVEUX. 

